source: postlfs/security/cracklib.xml@ 9623b6e8

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
   "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY cracklib-download-http "http://www.crypticide.com/users/alecm/security/cracklib,&cracklib-version;.tar.gz">
  <!ENTITY cracklib-download-ftp "ftp://ftp.cerias.purdue.edu/pub/tools/unix/libs/cracklib/cracklib.&cracklib-version;.tar.gz">
  <!ENTITY cracklib-http-md5sum "0c84ad7413d9dd3e5c2eaa5f97d53c4a">
  <!ENTITY cracklib-ftp-md5sum  "7f810e310c7f2df33d1eaa2b41ab2435">
  <!ENTITY cracklib-size      "21 KB">
  <!ENTITY cracklib-buildsize "21.8 MB">
  <!ENTITY cracklib-time      "0.05 SBU">
  <!ENTITY crackdict-size     "15.6 MB">
  <!ENTITY alldict-size       "466 KB">
]>

<sect1 id="cracklib" xreflabel="cracklib-&cracklib-version;">
  <?dbhtml filename="cracklib.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>Cracklib-&cracklib-version;</title>

  <indexterm zone="cracklib">
    <primary sortas="a-Cracklib">Cracklib</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to Cracklib</title>

    <para>The <application>cracklib</application> package contains a 
    library used to enforce strong passwords by comparing user selected 
    passwords to words in a chosen wordlist.</para>

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Download (HTTP): <ulink url="&cracklib-download-http;"/></para>
      </listitem>
      <listitem>
        <para>Download (FTP): <ulink url="&cracklib-download-ftp;"/></para>
      </listitem>
      <listitem>
        <para>Download MD5 sum (HTTP): &cracklib-http-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download MD5 sum (FTP): &cracklib-ftp-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download size: &cracklib-size;</para>
      </listitem>
      <listitem>
        <para>Estimated disk space required: &cracklib-buildsize;</para>
      </listitem>
      <listitem>
        <para>Estimated build time: &cracklib-time;</para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing='compact'>
      <listitem>
        <para>Required Patch: <ulink
        url="&patch-root;/cracklib,&cracklib-version;-blfs-1.patch"/></para>
      </listitem>
      <listitem>
        <para>Recommended Patch: <ulink
        url="&patch-root;/cracklib,&cracklib-version;-heimdal-1.patch"/></para>
      </listitem>
    </itemizedlist>

    <para>You will also need to download a wordlist for use with 
    <application>cracklib</application>. There are two wordlists 
    to choose from at the following location.  Use the 
    <filename>cracklib</filename> word list for good security, or 
    opt for the <filename>allwords</filename> word list for 
    lightweight machines short on RAM. You can of course choose 
    any other word list that you have at your disposal.</para>

    <itemizedlist spacing='compact'>
      <listitem>
        <para>cracklib (&crackdict-size;) at <ulink 
        url="http://www.cotse.com/tools/wordlists.htm"/></para>
      </listitem>
      <listitem>
        <para>allwords (&alldict-size;) at <ulink 
        url="http://www.cotse.com/tools/wordlists.htm"/></para>
      </listitem>
    </itemizedlist>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Cracklib</title>

    <para>First, as the <systemitem class="username">root</systemitem>
    user, install the chosen word list for 
    <application>cracklib</application>:</para>

<screen role="root"><userinput>install -v -d -m755 /usr/share/dict &amp;&amp;
install -v -m644 ../<replaceable>[wordlist]</replaceable> /usr/share/dict &amp;&amp;
ln -v -sf <replaceable>[wordlist]</replaceable> /usr/share/dict/words &amp;&amp;
echo $(hostname) >> /usr/share/dict/extra.words</userinput></screen>

    <para>The wordlist is linked to <filename>/usr/share/dict/words</filename> 
    as historically, <filename>words</filename> is the primary wordlist in the 
    <filename class="directory">/usr/share/dict</filename> directory. 
    Additionally, the value of <command>hostname</command> is echoed to a file 
    called <filename>extra.words</filename>. This extra file is intended to be 
    a site specific list which includes easy to guess passwords such as company 
    or department names, user's names, product names, computer names, domain 
    names, etc.</para>

    <para>Now apply the BLFS patch:</para>

<screen><userinput>patch -Np1 -i ../cracklib,&cracklib-version;-blfs-1.patch</userinput></screen>

    <para>If necessary, apply the <application>Heimdal</application> 
    patch:</para>

<screen><userinput>cp -R cracklib cracklib_krb5 &amp;&amp;
patch -Np1 -i ../cracklib,&cracklib-version;-heimdal-1.patch</userinput></screen>

    <para>Finally, as the <systemitem class="username">root</systemitem>
    user, build and install the package:</para>

<screen role="root"><userinput>make install &amp;&amp;
rm -v /lib/libcrack.so &amp;&amp;
ln -v -sf ../../lib/libcrack.so.2.7 /usr/lib/libcrack.so</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para><command>rm -v /lib/libcrack.so; ln -v -sf ... 
    /usr/lib/libcrack.so</command>: These two commands move the 
    <filename class='symlink'>libcrack.so</filename> 
    symlink from <filename class='directory'>/lib</filename> to 
    <filename class='directory'>/usr/lib</filename>.</para>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directory</segtitle>

      <seglistitem>
        <seg>create-cracklib-dict, mkdict, and packer</seg>
        <seg>libcrack.so and optionally, libcrack_krb5.so</seg>
        <seg>/usr/share/dict</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="libcrack">
        <term><filename class='libraryfile'>libcrack.so</filename></term>
        <listitem>
          <para>provide a fast dictionary lookup method for strong 
          password enforcement.</para>
          <indexterm zone="cracklib libcrack">
            <primary sortas="c-libcrack">libcrack.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>